<template>
  <view>
	  <view class="search-box">
		  <my-search @click="goSearch"></my-search>
	  </view>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
		  <block v-for="(item,i) in cateList" :key="i">
		     <view :class="['left-scroll-view-item', active === i ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
		  </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon.replace('dev','web')"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>
<script>
	export default {
		data() {
			return {
				wh:0,
				// 分类数据列表
				cateList: [],
				//动态添加高亮
				active:0,
				// 二级分类列表
				cateLevel2: [],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods:{
			async getCateList()
			{
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 3.2 请求失败
				if (res.meta.status !== 200) {
					return uni.$showMsg()
				}
				// 3.3 请求成功，为 data 中的数据赋值
				this.cateList = res.message
				//为二级菜单赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i)
			{
				this.active = i
				//重新为二级菜单赋值
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item3)
			{
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			goSearch()
			{
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
}
</style>
